A cobfobation op dela wabe



k/$1932. H. 1-1. WATERS v 18561 NEUTRAL BRAKE Original Filed Oct. 5,1925 Reiaued Aug. 9, 1932 This invention relates to a neutral lockingbrake for planetary reversing pulleys, transmission, or hoistingdrumsfand more particularly to the use of a neutral brake together withsuitable linkages whereby ahead, reverse and neutral clutches or brakesare operated under unitary control in properly timed relationship.

It is an object of this invention to provide or cable drums, in whichthe reverse rotation is secured through planetary gearing of the spur orbevel type by clamping the spider carrying the planetary gears, and thefor 15 ward motion is obtained by means of a clutch between the liveshaft and the pulley or cable drums floating thereon. The improvementcomprises a neutral brake for the pulley or cable drum. Such a brake ishighly desir- 2 able because it would otherwise behighly difficult tomaintain a true neutral'position between the reverse and forward drumswherein there will be no rotation of the final drive pulley.v or drum.This is especially true when there is only a light load on the pulley ordrum, because of the inherent motion when the pulley or drum is idle.

It is also an object of this invention to provide a brake on the pulleyor drum itself which is actuated by t e same lever which 4 operates theforward and reverse clutches thus placing complete control nism underone lever.

It is a further object of this invention to provide a device of theclass described having a self locking arrangement forthe brake mechanismadapted to securely lock the transmission or hoist in neutral with thebrake engaged.

Other and further important objects of this invention will be apparentfrom the-disclosures in the specification and drawing.

The invention (in a preferred form) is more fully described.

On the "drawing: Figure 1 is a side elevation of a reversingtransmission embodying the features of this invention;

l an improvement in reversing clutch pulleys or ulley 19 which is A triction of'the planetary gearing which is in alongside the pulley drum19 and carries of the mechaillustrated in the drawing andhereinafterUNITED STATES PATENT OFFICE HARRY H. WATERS, OF CLINTON, IOWA, ASSIGNORTO CLIMAX ENGINEERING COKPNY,

OF CLINTON, IOWA, A CORPORATION OF DELAWARE. .7

' NEUTRAL .zan'axn Original No. 1,819,449, dated lfareh 1, 1927, SerialNo. 60,367, fled October-'6, 1825. Application 1.01

reissue filed July 24,1930. Serial No. 470,508. V

Figure 2 is a detailed fragmentary section showin the neutral brakeengaging and locking mec anism; and

Figure 3 is a section on the line III-III of F igure'2 showing theinterconnected con- 85 trol mechanism for the forward and-reverseclutches and neutral brake.

As shown on the drawing: a

I The planetary reversing mechanism per se is'well known so that thegearin has been omitted from the drawing for t e sake of clearness. Aframe 10 is provided with suitable journals 11 for a live shaft 12carrying an outboard pulley 13 adapted to be driven by any suitableprime mover. The live shaft carries a clutch 14 shown in the drawing asa shoe clutch having centrifugal weights 15 on the sleeve 16 which iskeyed t0 and slides to the-left to contract the shoes 17,

the weights being provided to counteract .centrifu al action of theshoes and to permit a smoot and gradual decrease in the sli as theclutch picks up the load. The clutcli shoes engage on a Sllltible rim 18on a drum ree on the live shaft. 7

rake band drum 20 is provided alon side the clutch rim 18 for theneutral bra e of this invention. A spider 21 is also freely andseparately mounted on the live shaft planetary reversing gearing meshingwith suitable gearin within the pulley or drum 19. The periphery of thespider forms a brake drum 22 for the reversing brake band 23, clampingof this brake band while the clutch is disengaged from the pulley 19serves to drive the pulley in the reverse direction. This abovedescribed planetary reversing transmission is well known and isextensively used in marine reverse gears and in various industrialapplications, the present invention relating to the use of a neutralbrake together with interlocking operating mechanism therefor.

The reversin brake band 23 and the new ment therewith which serves tohold the operating mechanism without attention from the operator. Thebrake band is retracted when, released by means of the sprlngs 33.

. This operating structure may be convenient- 'ly mounted on a crossframe comprising a pair of angles 34 with the pivoted levers 28 mountedtherebetween, the cam being pivoted on a block 35 secured between theangles and forming a spacer therefor. It is of course apparent that atoggle operating mechanism of an well known form might be used inconnection with the reversing band in lieu of the cam mechanism justdescribed.

The operatin mechanism interconnectin the reverse bra lie cam 36 withthe neutrad brake cam 31 and the clutch shifting lever 37 comprises asingle lever 38 connected to the arm 39 of a bell crank pivoted at 40 bythe push and pull rod 41. On the arm 39 intermediate the rod 41 and thepivot of the bell crank, a short connecting rod 42 leads to a crank 43secured to the reverse brake cam 36, which is operated to engageattachment is so chosen that in the position 4 shown in Figure 3 theclutch is disengaged and a like remark applies to the location of therod 42 for the reverse brake, the neutral wherein the rollers 30 on thelevers 28 drop back slightly into the recesses provided in the cam. Thisslight loosening of the brake hand does not release the brake for thereason that the coeflicient of friction at rest is greater than whenthere is relative motion 55 between the brake band and the drum so thatthe slight slackening simply relieves the maximum stress in 'the brakemechanism without reducing the holding power of the brake below a safelimit. 50 The operation ofthe unitary'control mechanism is through the'medium of the lever 38 and rod 41; pulling on the lever moving the rod41 downwardly in Figure 3 and further rotating the reverse camcounterclockwise from its already disengaged posiand lock the reversebrake band by a clocktion as shown in the figure. This same movementreleases the neutral brake by.rotating the cam 31 and pushes the forwardclutch shifting lever into clutch en aging position for .direct forwarddrive 0 the pulley or drum. The reverse of the above described operationfirst 'disengages the direct drive clutch and next applies the neutralbrake to bring the drum or pulley to a full stop before engaging thereverse brake by a further movement of the lever 38 which at the'sametime releases the neutral brake. Theneutral brake thus assists verymaterially in bringing the pulley,.and the mechanism driven therefrom,to a quick stop, thus expediting reversal with less strain ,and wear onthe forward clutch and the reverse brake band.

The brake mechanism itself affords a greatly simplified structure thatis readily adjustable, "as both the spring tension for,

retracting the brake linkage and the brake itself are adjustable to suitthe operating conditions. The brake band as a whole is self wrapping andequally eflicient in either direction of motion so that little force isrequired, to operate the cam and the notches therein need not be deep toassure a positive lock in brake set position.

I am aware that many changes may be. made and numerous'details ofconstruction may be varied through a wide range without departing[ fromthe principles of this invention and therefore do not purpose limitingthe patent granted thereon otherwise than necessitated by the prior art.

I claimas my invention:

1. In a device of the class described, a constantly rotating shaft, apulle rotatab'ly mounted on'said shaft, a clutch or coupling said pulleyto said shaft, reversing caring for said pulley, a neutral brake forolding said pulley stationary, and a single operatthe reversing gearing,and the neutral brake, whereby the application of the neutral brake isautomatically performed when reversing H the direction of rotation ofsaid pulley. brake being shownin engaged posltion 2. In a device of theclass described, a constantly rotating shaft, a reversible driven pulleymounted on the shaft, a neutral brake, and operating mechanism thereforinterconnected with the "ulley reversing mechanism whereby the braG'Wlll be applied during a reversing operation.

3. In a device of the class'described, a constantly rotating shaft, areversible pulley ing mechanism interconnecting the clutch,

mounted on the shaft, forward and reverse driving mechanisms for thepulley, a neutral brake, and means adapted for sequential I operation ofthe 'mechanisms and brake whereby the brake will be applied during theshiftj'from onemechanism to the other..

4. In a device of the class described, a constantly rotating shaft, :1pulley freely mounted on the shaft, a-clutch for clutching the pulleyand the shaft for Causing the gulley to rotate in a direction reverse tothe irection of rotation of the shaft, means for selectively actuatingthe clutch and the reversing mechanism, said means including a. unitaryoperating lever, a brakefor holding the pulley momentarily againstrotation during a change in the direction of rotation, and means foroperating the neutral brake, said latter named means being responsive tothe operation of the means for selectively 5. A transmission including alive shaft, a drum thereon, a direct drive clutch between said shaft anddrum, a reverse drive for said drum, a brake associated with said drum,means for automatically applying said brake when shiftin from one driveto the other and means for automatically locking said brake in theengaged-Y position wherein both I drives are 6. Inade'vice e the classdescribed a constantlyi-r-snotatiag"Eshaft, a pullefy rotatablymountdonsaid shaft, 1 said pulley to said a I for said pulley, a pulleystationary, reversing gearing. reversing posit'iomi. tion, and anintermediate neutral position, and means actuable by said common controlin its neutralposition for a ating said brake. 7. A reverse pulley of thchagaeterdescribed having, in combinatio driveshaft, a drum looselymomma 621' the means for clutching the othe shaftfordr rect drive, aplanetary,- reverse mechanism drive the drum in a direction 0 posite tothe direction of rotation of/the-sha ,izada neutral brake associatedwith the drum, said brake comprising ,a band arranged to surround thedrum, the terminal portions of the lowers connected with the terminalportions of the band, and a cam for actuatin the followers to causeapplication of the rake.

8. A reverse pulley of the character described havingfin-combination, adrive shaft, a drum loosely mounted on the shaft, a clutchmechanismjfmounted on theshaft for connecting thdrum therewith, areverse mechanism mounted on the shaft for driving the drumin adirection-opposite to the direction of rotation of the shaft, and aneutral brake for holding the drum stationary during rotation oftheshaft, said brake compr sing a drum, a band encircling the drum withthe terminal portions of the band located beneath the drum, rocker armsconnected to the said terminal portions of the band, said the pulley tothe shaft for rotation therewith,

a reversing mechanism extending between actuating the clutch and thereversing mecha-v a'ssociated with the -drum and adapted to portions ofthe band, said rocker arms beingl band being disposed beneath the drum,fol-' rocker arms bein constructed and arranged to support the drum, andmeans for actuating the rocker arms to cause actuation of the brake,said means comprising a cam and operating means therefor.

9. A reverse pulley of the character described having, in combination, adrive shaft, a drum loosely mounted on" the shaft, a clutch mounted onthe shaft for connecting the drum therewith, a reverse mechanism mountedon and normally free of the the sh ftfor driving the drum in a directionoppositeto the irection o frotation of the shaft, said clutch andreverse mechamsm being adapted for sequential operation,

therefor interconnected with the clutch and reverse mechanism wherebythe neutral brake will be applied intermediate the shift from the drivein one direction to the other, said neutral brake comprising a drum, :1band enshaft, a drum loosely mounted on the shaft, a clutch mounted onthe shaft for connecting the drum therewith, a reverse mechanism mountedon the shaft for drivin the drum in a direction opposite to thedirection of rotation of the shaft, said clutch and reversemechanism'being adapted for sequential o eration, a neutral brake andoperating mec anism therefor interconnected'with the clutch and reversemechanism whereb the neutral brake will be applied intermediate theshift from the drive in one direction to the other, said neutral brakecomprising a drum, a band encircling the drum with the rminal portionsof the band locatemheneath the drum, rocker arms connected to the saidterminal constructed and arranged to support the ba normally free of thedrum, and fneans for actuating the rocker arms to cause'iactuation ofthe brake, said means comprising a cam and operating means therefor. 11.A reverse pulley of the character described having, in combination,driven means and driving means, one of said means being adapted looselyto encircle the other of said means, mechanisms for connecting saiddriving means with said driven means in such a manner that the latter isdriven in either a forward or reverse direction of rotation, a controlfor causing sequential operaa neutral brake and operating mechanism saiddriven means against rotation in either v direction during thesequential operation of the driving means.

12. A reverse pulley of the character described having, in combination,driven means and driving means, one of said means being mounted upon andadapted loosely to encircle the other, a first-named mechanism for eonnthe said means to cause rotation I of the driven means in a forwarddirection, a second-named mechanism for connecting said means to causerotation of said driven means in a reverse direction, a unitary controlfor efiecting sequential operation of the to forward and reverse drivemechanisms, a brake drum carried b the driven means a band surroundingsai drum, and means for actuatin the bandto cause operation of the ibrake w ereby the driven means may be held 16 against rotation in eitherdirection durin the'sequential operation of said forward an reversedrive mechanisms.

13. In a device of the class described, including a driving means withina final driven no means, a direct drive and a reversing drive Itherebetween, a neutral brake adapted to stop the driven means whenshifting from one drive to the other and a single operatin mechanisminterconnecting the direct an 85 reverse driving mechanisms and neutralbrake whereby the application of the neutral brake is automaticallyperformed by a shifl; from one driving means to the other.

Signed at Clinton, Iowa, this 12th day of :0 July, 1930.

- HARRY H. WATERS.

